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Property, plant and equipment
12 Months Ended
Dec. 31, 2012
Property, plant and equipment  
Property, plant and equipment

5. Property, plant and equipment

        Property, plant and equipment are summarized as follows:

 
  December 31,  
 
  2012   2011  

Land

  $ 960   $ 960  

Land improvements

    1,768     1,768  

Buildings

    12,852     12,660  

Machinery and equipment

    24,286     23,253  

Furniture and fixtures

    7,465     7,255  

Mobile equipment and other

    1,138     1,216  

Construction-in-process

    351     748  
           

Total property, plant and equipment

    48,820     47,860  

Less accumulated depreciation

    (28,933 )   (26,520 )
           

Net property, plant and equipment

  $ 19,887   $ 21,340